/*
 * FindBugs - Find bugs in Java programs
 * Copyright (C) 2004 University of Maryland
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package edu.umd.cs.findbugs;

import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * Search for bug instances whose text annotations contain
 * one of a set of keywords.
 */
public abstract class QueryBugAnnotations {
	// Bug's text annotation must contain one of the key
	// words in order to match
	private HashSet<String> keywordSet = new HashSet<String>();

	/**
	 * Add a keyword to the query.
	 * A BugInstance's text annotation must contain at least
	 * one keyword in order to match the query.
	 *
	 * @param keyword the keyword
	 */
	public void addKeyword(String keyword) {
		keywordSet.add(keyword);
	}

	/**
	 * Scan bug instances contained in given file,
	 * reporting those whose text annotations contain at least
	 * one of the keywords in the query.
	 *
	 * @param filename an XML file containing bug instances
	 */
	public void scan(String filename) throws Exception {
		BugCollection bugCollection = new SortedBugCollection();
		bugCollection.readXML(filename);
		scan(bugCollection, filename);
	}

	/**
	 * Scan bug instances contained in given bug collection,
	 * reporting those whose text annotations contain at least
	 * one of the keywords in the query.
	 *
	 * @param bugCollection the bug collection
	 * @param filename      the XML file from which the bug collection was read
	 */
	public void scan(BugCollection bugCollection, String filename) throws Exception {
		Iterator<BugInstance> i = bugCollection.iterator();
		while (i.hasNext()) {
			BugInstance bugInstance = i.next();

			Set<String> contents = bugInstance.getTextAnnotationWords();
			for (String aKeywordSet : keywordSet) {
				if (contents.contains(aKeywordSet)) {
					match(bugInstance, filename);
					break;
				}
			}
		}
	}

	/**
	 * Called when a bug instance contains a query keyword.
	 *
	 * @param bugInstance the bug instance containing the keyword
	 * @param filename    name of the file containing the bug instance
	 */
	protected abstract void match(BugInstance bugInstance, String filename) throws Exception;
}

// vim:ts=4
